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Finish the statement: It is possible to distinguish between_______22 MHz transmissions and________20 MHz transmissions when looking at an FFT plot.
You have installed a new 802.1 lac WLAN configured with 80 MHz channels. Users in one area are complaining about poor performance. This area is currently served by a single AP. You take a spectrum analysis capture in the poor performing are a. While examining the waterfall plot you notice the airtime utilization is higher on the first 20 MHz of the 80 MHz channel when compared to the rest of the channel. What do you conclude?
You are troubleshooting a client that is experiencing slow WLAN performance. As part of the troubleshooting activity, you start a packet capture on your laptop close to the client device. While analyzing the packets, you suspect that you have not captured all packets transmitted by the client. By analyzing the trace file, how can you confirm if you have missing packets?
When performing protocol analysis, you capture an 802.1 lac data frame on channel 52, transmitted at MCS 8. At what data rate was the PHY Preamble transmitted?
What is the difference between a Data frame and a QoS-Data frame?
After examining a Beacon frame decode you see the SSID Element has a length of 0. What do you conclude about this frame?
You're the WLAN administrator for a large retailer based at the HQ in New York. The London-based office has been complaining about WLAN disconnections around lunch time each day. You suspect this might be interference from the staff microwave, how might you test your theory from the New York office?
In what scenario is Open Authentication without encryption not allowed based on the 802.11 standard?
Why would a STA that supports 802.11k Radio Measurement send a Neighbor Request to an AP?
How many frames make up the Group Key Handshake excluding any Ack frames that may be required?

Question 22 - CWAP-404 discussion

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Finish the statement:

It is possible to distinguish between_______22 MHz transmissions and________20 MHz transmissions when looking at an FFT plot.

A.
HR/DSSS and ERP
Answers
A.
HR/DSSS and ERP
B.
OFDM and HT
Answers
B.
OFDM and HT
C.
ERP and VHT
Answers
C.
ERP and VHT
D.
HT and VHT
Answers
D.
HT and VHT
Suggested answer: B

Explanation:

It is possible to distinguish between OFDM 20 MHz transmissions and HT 20 MHz transmissions when looking at an FFT plot. OFDM and HT are two different modulation schemes used by 802.11 WLANs. OFDM is used by legacy 802.11a/g devices, while HT is used by newer 802.11n/ac devices. OFDM and HT have different spectral characteristics that can be observed on an FFT plot. OFDM transmissions have a flat spectrum with sharp edges, while HT transmissions have a tapered spectrum with rounded edges. This is because HT uses guard intervals and cyclic prefixes to reduce inter-symbol interference and improve performance. The other options are not correct, as they do not describe different modulation schemes or channel widths that can be distinguished on an FFT plot.Reference:[Wireless Analysis Professional Study Guide CWAP-404], Chapter 3: Spectrum Analysis, page 70-71

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asked 16/09/2024
Gaurav Nayak
43 questions
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